
        .img {
            width: 350px;
            height: 350px;
            background: url('./imgs/1.jpg');
            position: relative;
        }
        
        .mask {
            width: 50px;
            height: 50px;
            background: yellow;
            opacity: .5;
        
            position: absolute;
            left:0px;
            top: 0px;
            display: none;
        }
        
        .enlarge {
            width: 100px;
            height: 100px;
            background: url('./imgs/1.big.jpg');
            background-position: 0px 0px;
            display: none;
            background-repeat: no-repeat;
        }